omnisharp-roslyn: move to pkgs/by-name

pkgs/by-name/om/omnisharp-roslyn/updater.sh

@@ -7,7 +7,7 @@ set -euo pipefail
 cd "$(dirname "${BASH_SOURCE[0]}")"
 
 new_version="$(curl -s "https://api.github.com/repos/OmniSharp/omnisharp-roslyn/releases?per_page=1" | jq -r '.[0].name')"
-old_version="$(sed -nE 's/\s*version = "(.*)".*/\1/p' ./default.nix)"
+old_version="$(sed -nE 's/\s*version = "(.*)".*/\1/p' ./package.nix)"
 
 if [[ "$new_version" == "$old_version" ]]; then
   echo "Already up to date!"

pkgs/top-level/all-packages.nix

@@ -39018,8 +39018,6 @@ with pkgs;
     nanoizeNewlib = true;
   };
 
-  omnisharp-roslyn = callPackage ../development/tools/omnisharp-roslyn { };
-
   wasmtime = callPackage ../development/interpreters/wasmtime {
     inherit (darwin.apple_sdk.frameworks) Security;
   };